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Irr - S 39 over Rosebud Creek

Rosebud County, Montana · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Irr - S 39 over Rosebud Creek in Rosebud County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 2004, making it 21 years old at the 2025 inventory.
It carries about 671 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 18 of the 112 inventoried bridges in Rosebud County rated good (16.1%); 7 (6.2%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 145 ft
Location	9M SE Colstrip
NBI structure number	P00039013+04521
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.

Bridge	Built	Vehicles/day	Condition
Irr Bia Rte 6 over Lame Deer Creek	1976	3,000	Good
I 94 over Int East Forsyth	1977	2,749	Fair
I 94 over Int East Forsyth	1977	2,749	Fair
I 94 over Int W Rosebud 446-447	1970	2,636	Fair
I 94 over Int W Rosebud 446-447	1970	2,636	Fair
I 94 over Rosebud Creek	1970	2,636	Fair